Redovito izraz alata za provjeru interneta
1, implementirajte internetske prilagođene regularne izraze za izdvajanje tekstualnog sadržaja
2, validateSvaki regularni izraz
Što je točno regularni izraz ?
Pri pisanju programa ili web stranica koje obrađuju nizove, često je potrebno pronaći žice koji udovoljavaju određenim složenim pravilima.Redovni izrazi su alati koji se koriste za opisivanje ovih pravila.Drugim riječima, regularni izrazi su kôd koji bilježi tekstualna pravila.
Common metacharacters
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Code
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Description
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.
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Matches any character except newline
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\w
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Match letters or numbers or underscores
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\s
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Matches any whitespace
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\d
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Matching numbers
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\b
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Match the beginning or end of a word
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^
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Match the beginning of a string
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$
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Match end of string
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Common qualifiers
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Code / syntax
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Description
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*
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Repeat zero or more times
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+
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Repeat one or more times
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?
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Repeat zero or one time
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{n}
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Repeat n times
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{n,}
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Repeat n or more times
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{n,m}
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Repeat n to m times
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Common antonyms
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Code / syntax
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Description
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\W
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Matches any characters that are not letters, numbers, underscores, or Chinese characters
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\S
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Matches any character that is not a space character
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\D
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Matches any non-digit character
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\B
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Matches where the word is not beginning or ending
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[^x]
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Matches any character except x
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[^aeiou]
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Matches any character except the letters aeiou
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